Vol. XXVII, pp. 77-80 
May 11, 1914 
PROCEEDINGS 
OF THE 
BIOLOGICAL SOCIETY OF WASHINGTON 
DESCIUPTION OF A NEW ENGYSTOxMATID FROG OF 
THE GENUS HYPOPACFIUS. 
P.Y ALEXANDER G. RUTMVEN. 
Among the amphibians brought from Colombia by the 
Bryant Walker Expedition of the University of Michigan 
(1913), are 12 specimens of an Engystomatid frog that seems 
to be imdescribed. The writer takes great pleasure in dedicat¬ 
ing this species to Dr. A. S. Pearse, the carcinologist of the 
expedition, who very materially assisted in the berpetological 
work. 
Hypopachus pearsei sp. nnv. 
Diagnosis .—Precoracoids very weak; sternum a cartilaginous plate, no 
omosternum. Diapophyses of sacral vertebrae moderately dilated. Pupil 
erect. Tongue elliptic, entire, free behind. No vomerine teeth; a ridge 
across the palate in front of the internal nares and another anterior to 
the oesophagus. Tympanum concealed. Head small; body large; limbs 
short. Total length of largest specimens, 40-47 mm. Snout pointed, on 
the average twice as long as the diameter of the eye. Tibio-tarsal articu¬ 
lation reaching the elbow when the limbs are extended along the sides. 
Eore-limh when extended forward reaching beyond the snout by the 
length of the longest toe or less than this distance. Eingers free; toes 
free or with slight rudiment of weh. A low inner metatarsal tubercle, 
no outer tubercle. Skin smooth; a fold around the head behind the 
eyes. Color above bluish slate l)lack or blackish slate* with a tew minute 
white dots or very many small white spots; generally a trace of a fine 
median white line. Chin and throat as above or a little lighter, with 
very numerous white spots and a few pinkish spots. In adults the undei 
surface of the body and limbs and the upper side of the hind feet ahont 
carrot red with irregular blackish reticulations, the dark areas frequently 
with small white spots. Inguinal and a.xillary regions and anterior and 
♦Color .Standards and Color Noinonclatnre, Robert Ridgway, lOlC. 
IG—Ptioc. Rion. .Soc. W.vsH., Von. XXVI1,1914. 
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